imp - Stop() waits until playback stops

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We've used a spin wait mechanism to wait until we declare the playback as stopped.

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Type: imp
Breaking: False
Doc Required: False
Part: 1/1

BassBoom.Basolia/Playback/PlaybackState.cs

@@ -35,6 +35,10 @@ public enum PlaybackState
         /// <summary>
         /// Music has been paused by the user or by the call to the <see cref="PlaybackTools.Pause"/> function
         /// </summary>
-        Paused
+        Paused,
+        /// <summary>
+        /// Music is stopping
+        /// </summary>
+        Stopping,
     }
 }

BassBoom.Basolia/Playback/PlaybackTools.cs

@@ -149,7 +149,7 @@ public static void Play()
                         FeedRadio();
                     }
                 } while (err == (int)mpg123_errors.MPG123_OK && Playing);
-                if (Playing)
+                if (Playing || state == PlaybackState.Stopping)
                     state = PlaybackState.Stopped;
             }
         }
@@ -187,7 +187,8 @@ public static void Stop()
                 throw new BasoliaException("Can't stop a file that's not open", mpg123_errors.MPG123_BAD_FILE);
 
             // Stop the music and seek to the beginning
-            state = PlaybackState.Stopped;
+            state = state == PlaybackState.Playing ? PlaybackState.Stopping : PlaybackState.Stopped;
+            SpinWait.SpinUntil(() => state == PlaybackState.Stopped);
             if (!FileTools.IsRadioStation)
                 PlaybackPositioningTools.SeekToTheBeginning();
         }